Exercise logic.propositional.cnf.unicode

Description
Proposition to CNF (unicode support)

Derivation

Final term is not finished

¬((r ∨ r) ↔ r) ∨ ¬T ∨ ¬¬¬r

⇒ logic.propositional.notnot

¬((r ∨ r) ↔ r) ∨ ¬T ∨ ¬r